I actually made this months ago but never shared it, so here it is! To install:

1. Install the Stylish extension.
2. Open this link.
3. Go to Stylish's Manage Styles page and create a new style.
4. Click "import" on the sidebar under the Mozilla Format header.
5. Paste everything from the .css file into the textbox.
6. Click "overwrite style" near the bottom.
7. Hit save on the sidebar.

Note that this will probably break when you use any site scheme except for "SMW Central - menu right" (the default). This means that sadly you can't preview it during C3, but you will have to do with the screenshots.

Luckily the site scheme was unenforced for reasons so I can check this out.

The scheme is overall pretty serviceable, though I haven't checked anything thoroughly. The only problems I've noticed are that there's no site banner at the top and also there's no space between the userlist and the C3/ad boxes:

The logo is smaller and on the far left. I felt I liked that more. The lack of space between the ropebox and stuff can be fixed by commenting out the block that says "hide some extra padding". Idk why i left it there.

I'll be honest, I think this theme is good enough that it could actually become one of the site's themes. My concerns so far are the same as Noivern's, and as for the banner, I think it looks weird all the way to the left of the page. It's just my opinion, but I'd prefer if it was center-aligned like the other themes.

Overall, I just like all the blue everywhere. The graphics that are used in all the borders, the background, it's all neat.